Easy-to-grow annuals include cannas, sweet Caroline, sunflowers and Gerbera daisies. Some of these plants grow from seed like sunflowers, while others can be bought as small plants and transplanted to a garden or pot to reach full size.
Cannas are a tropical style of flower that grows up to six feet tall. If this flower is planted in a northern climate then it needs to have full sun all day in order to grow and bloom. The flower is in a large clump when it grows and likes rich, well-drained soil.
Sweet Caroline is a type of sweet potato plant. It can be grown in a pot or in a garden as long as there is full to partial shade. They grow to between six to eight inches. The plants grow and create a trailing vine of sorts that can trail up to 60 inches. The vibrant reddish purple leaves stand out in a garden or landscaping.
Gerbera daisies have long stems with a long-blooming flower. The flowers are bright and large, sometimes four to five inches across. These flowers do best in full sun unless there is extreme heat; then afternoon shade is beneficial. The plant likes soil that is well drained, but will not die if it dries out a bit.